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Old 4th May 2002, 08:43 AM   #1
topfee is offline topfee  Greece
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Question 211 power amp

Dear DIY fellows

Hello from Athens, Greece

I would like to build a power amp with four (4) 211/VT-4-C tubes per channel in push-pull configuration with one pair of tubes to each side of the push-pull. I have the output and the power transformers the tubes and the sockets. Can any of you provide a schematic diagram or a site that I can find what I need? The tubes have to be powered with 1000V plate B+ do to the transformer output that I already have.
Thanks in advance.
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Old 4th May 2002, 10:22 AM   #2
stigla is offline stigla  Norway
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Just a couple of amps that use 2x 211 / vt4c's a channel is all I know of...

The first here uses a 15k primary on the OPT. Theoretically (as far as I know) you could halve the Prim imp with 4 tubes.
What specs have your Irons?

http://poseidon.cantech.net.au/~supra/211p-p.html

The second is in some wierd language... This one has an IT! Good. 10k prim imp on the OPT here...
http://www.audiokit.it/ITAENG/Creature/ARBOS/ARBOS.HTML

This one has no accopanying text, and seems like a OK design...
http://www.almuse.com/images/211_2.gif

I'm not very experienced in things like this, but I'm sure some experts will shed some light over it.

One thing though... With 4x 211, you will need some hefty driverstage! Make sure that you have got enough headroom!

Stig
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Old 6th May 2002, 09:35 PM   #3
topfee is offline topfee  Greece
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Question 211 power amp

You people here seem to be with a lot of know-how about tubes, and I need your help.

I would like to build a power amp with four (4) 211/VT-4-C tubes per channel in push-pull configuration with one pair of tubes to each side of the push-pull (eight (8) tubes for both channels). I have the output and the power transformers the tubes and the sockets and all kind of electrolytic caps, diodes and tubes. Can you provide (design) the schematic diagram for the power amp and the power supply that I need? If yes I will give you all the values for all the parts I have. I also will pay you for your work.
There is anybody that can desing the above amp?
Thanks in advance.

Best regards

Kyriakos
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Old 22nd May 2002, 07:31 AM   #4
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I can't design but do know of an amp that used 4 6V6s in a PP circuit. It is a Hammond Tone Cabinet amp from 1949. I know this is way off from 211s but it might be worth taking a look at because it would work the same way. There is a Hammond Organ news group in <www.google.com> Post there and you might get the schematic by email. Besides the amplifier circuit the power supply is also interesting in that there are no electrolitic capacitors. Just low uF oil caps and big chokes. Good luck on your project. If you can't get the help you need buy a Tube Cad to help you design your schematic on your computer. I sure need to get one.
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Old 22nd May 2002, 11:35 PM   #5
topfee is offline topfee  Greece
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Talking 211 help

Thanks for your help David Thatcher from lovely Texas I have been there in late 80's for five months you have nice girls over there.........

Kyriakos
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Old 23rd May 2002, 12:21 AM   #6
PassFan is offline PassFan  United States
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Erno Borbely designs one offs if your willing to pay for his services and he is in southern germany as well. His site is www.borbelyaudio.com and you can reach him there. Good Luck
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Old 23rd May 2002, 03:49 AM   #7
grataku is offline grataku  United States
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"I would like to build a power amp with four (4) 211/VT-4-C tubes"

so would I topfee, so would I...
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